Been wanting a 10mm myself but have not pulled the trigger on one yet. How does the glock 20sf grip feel size wise versus the xdm? I have medium sized hands and the glock 20sf is about boderline for me.
Clean the threads. Sometimes there’s those tiny little rounds beads Savage use as lock tight and will get the nut stuck.
If the thread diameter measures 1.05 then it’s more than likely a small (standard) shank barrel. Large shanks measure 1.12 and will have a step down after the threads.